ADS1230IPWR – 20 Bit Analog to Digital Converter For Bridge Sensors

Features for the ADS1230 Complete Front-End for Bridge Sensor Onboard PGA with Gain of 64 or 128 Onboard Oscillator RMS Noise: 40nV at 10SPS (G = 128) 88nV at 80SPS (G = 128) 18-Bit Noise-Free Resolution Selectable 10SPS or 80SPS Data Rates Simultaneous 50Hz and 60Hz Rejection at 10SPS External Voltage Reference up to 5V for Ratiometric Measurements Simple, Pin-Driven Control Two-Wire Serial Digital Interface Tiny 16-pin TSSOP Package Supply Range: 2.7V to 5.3V -40?C to 85?C Temperature Range Description for the ADS1230 The ADS1230 is a precision 20-bit analog-to-digital converter (ADC). With an onboard low-noise programmable gain amplifier (PGA), onboard oscillator, and precision 20-bit delta-sigma ADC, the ADS1230 provides a complete front-end solution for bridge sensor applications including weigh scales, strain gauges, and pressure sensors. The low-noise PGA has a gain of 64 or 128, supporting a full-scale differential input of ?39mV or ?19.5mV, respectively. The delta-sigma ADC has 20-bit effective resolution and is comprised of a 3rd-order modulator and 4th-order digital filter. Two data rates are supported: 10SPS (with both 50Hz and 60Hz rejection) and 80SPS. The ADS1230 can be clocked by the internal oscillator or an external clock source. Offset calibration is performed on-demand, and the ADS1230 can be put in a low-power standby mode or shut off completely in power-down mode. All of the features of the ADS1230 are controlled by dedicated pins; there are no digital registers to program. Data are output over an easily-isolated serial interface that connects directly to the MSP430 and other microcontrollers. The ADS1230 is available in a TSSOP-16 package and is specified from -40?C to 85?C.